⑴ 维生素D的单位是什么
1iu等于0.00928mg。其中,iu等于100g。并且,维生素包括很多中,有些维生素是用IU做单位的,有些维神脊生素是用mg,g做单位的,还有些维生素是用ug做单位的。IU是国际单位的意思,1IU等于1000单位。
单位换算:
一微克(μg)等于40国际单位(IU),4.5微克维生素D3等于180国际单位。
母乳中含有的维生素一般能满足婴儿燃瞎轿的需求,除非喂非婴儿配方奶粉时,注意补充维生素,从出生2周到1岁半之内都应皮肆添加维生素D。婴儿每天维生素D的参考摄人量为lOμg(400IU)。
⑵ 国际单位125维生素D是多少
你好,iu
是国际单位(international
unit)的缩写,常在药品中使用。像维生素类!国际单位是用生物活性来表示某些抗生素、激素、维生素及抗毒素量的药学单位。
维生素d3:1
国际单位(iu)
=
0.025μg
维生素d3(晶体)
=
1
美国药典单位(usp)
=
1
国际雏鸡单位(icu)
⑶ d3 400国际单位是多少毫克
400国际单位相当于10微克,即0.01毫克。
维生素D3的计量单位有两种,即重量单位与国际单位。
1微克D3相当于40国际单位。
因为:1毫克=1000微克,
所以:400国际单位相当于10微克,即0.01毫克。
(3)维生素d3125国际单位相当多少微克扩展阅读:
国际单位使用规则
关于单位的名称及其简称都已有明确的规定。简称在不致混淆的情况下可等效它的全称使用,习惯上只使用简称的单位可继续使用,例如在一些十进倍数单位中,如只用“毫安”而不用“毫安培”。但也不排斥使用“毫安培”。
组合单位的名称与其符号书写的次序一致。符号中的乘号没有对应名称,符号中的除号对应名称为“每”,无论分母中有几个单位,“每”只在除号的地方出现一次。
例如:加速度SI单位的符号是m/s2,其名称为“米每二次方秒”而不是“米每秒每秒”;电能量的常用单位符号kW·h的名称为“千瓦时”而不是“千瓦乘小时”。
乘方形式的单位名称,其顺序是指数名称在单位的名称之前,相应指数名称由数字加“次方”二字而成。例如:断面惯性矩单位符号m4的名称为“四次方米”,而不是“米四次方”。
指数是-1的单位,或分子为1的单位,其名称是以“每”字开头。例如:线膨胀的系数的SI单位℃-1或K-1,其名称为“每摄氏度”或“每开尔文”而不是“负一次方摄氏度”或“负一次方开尔文”等。
如果长度的2次和3次幂是指面积和体积,则相应的指数名称为“平方”和“立方”,并置于长度单位的名称之前。
例如:体积的SI单位符号m3的名称为“立方米”,不能称为“米立方”或“三次方米”,面积的常用单位符号km2的名称为“平方千米”不能称为“千米平方”或“二次方千米”。
选用的倍数和分数单位,一般应使数值处于0.1—1 000范围内。例如:1.2×104N可写成12kN;0.00394m可写成3.94mm;11401Pa可写成11.401kPa;3.1×10-8s可写成31ns。某些场合习惯使用的单位不受上述限制。
例如:机械制图中使用的单位毫米;国土面积单位平方千米;导线截面积使用的单位平方毫米等。在同一个量的数值表中以及叙述文章中,为了对照方便,也可使用相同单位而不考虑数值是否处0.1—1 000范围。
词头:百、十、分、厘(h,da,d,c)一般只用于某些长度、面积、体积和其它早已习惯的场合。例如:可以用于分贝dB等。
有些国际单位制以外的单位,可以按习惯使用词头构成倍数或分数单位。在法定计量单位中,只有吨、升、电子伏、分贝(只有“贝”前加词头)、特克斯这几个单位有时加词头使用。
⑷ 维生素的国际单位与重量如何换算
维生素A,它一个国际单位相当于维生素A乙酸盐0.344UG(微克)的生物效价.
换算如下:
维生素A:1 国际单位(IU) = 0.300μg 结晶视黄醇 = 0.344μg 维生素A醋酸酯 = 0.550μg 维生素A棕榈酸酯 = 0.358μg 维生素A丙酸酯 = 1 美国药典单位(USP)
注:维生素A、维生素D等,这些药物尚无纯品,如用重量单位表示,就不能反映出内在有效成分的真实含量,故改用相对计量方法以特殊“单位”表示该药的效价.一般以1mg为1个国际单位(IU)
不同的药物是各不相同的。如国际单位制导出的酶活性单位是mol/s,即每秒酶促反应转化的底物的量,如酶活性单位用国际单位(IU或U)者,可按1IU=1μmol/min或1IU(或U)=16.67nmol/s换算维生素A,它一个国际单位相当于维生素A乙酸盐0.344UG(微克)的生物效价。而这个生物效价,是以幼年鼠,喂以缺乏维生素A的食物,与喂以标准品的鼠的发育程度所比较,所得到的数据。维生素E有三种度量方法:国际单位(IU)、毫克(mg)和当量(RE)。换算关系为:1IU d-α-生育酚=1.49mgα-生育酚=1.49α-生育酚当量看到的另一种结果 400 IU的维生素E=267 mg的维生素E 也就是:1 IU的维生素E=0.668 mg的维生素E;1 mg的维生素E=1.5 IU的维生素E
⑸ 维生素当量及单位换算
一个国际单位相当于0.025微克的维生素D3,一微克的维生素D3有40国际单位.所以7.5微克的维生素d相当于300单位的维生素d。 1ug等于40单位的维生素d,7.5ug应该相当于300单位。我们每天维生素d的生理需要量,至少应该在400到600单位。
Vitamin A Technical Details:
Vitamin A is a fat-soluble vitamin. It is important for vision, bone growth and cell division.
Vitamin A consists of Retinol from animal sources, and Provitamin A Carotenoids from plant sources.
Retinol is referred to as pre-formed vitamin A. This means that it can be used directly by the body.
Provitamin A Carotenoids are Vitamin A precursors . This means that they are converted to Vitamin A by the body. However, conversion of the carotenoids is less efficient than that of retinol.
The Provitamin A Carotenoids are beta-carotene, alpha-carotene, beta-cryptoxanthin, lycopein, lutein and zeaxanthin (lutein and zeaxanthin are combined in the current database). The carotenoids are responsible for the red and yellow pigments of plants.
A unit called Retinol Activity Equivalents (RAE) is used to compare the Vitamin A activity of the different forms of Vitamin A. 1 µg (microgram) of retinol is equivalent to 1 µg RAE. However it takes 12 µg beta-carotene to equal 1 µg RAE, and 24 µg of the other carotenoids to equal 1 µg RAE. The following table summarizes the conversion of vitamin A values to RAE:
Historical Measures of Vitamin A
Previously, a unit called International Units (IU) was used to describe Vitamin A activity. However, at the time International Units for Vitamin A were defined (1989), it was thought that beta-carotene was half as concentrated as retinol (beta-carotene is now considered to be only 1/12 as concentrated as retinol).
Because of this, Vitamin A measurements expressed as IU tend to over-state the contribution of the provitamin A carotenoids. The following table summarizes the conversion of Vitamin A values to IU:
When it was determined that IU tended to overstate the contribution of the provitamin A carotenoids, a new unit called Retinol Equivalents (RE) was defined to describe the new values. At the time beta-carotene was thought to be 1/6 as concentrated as retinol. The following table describes the conversion of vitamin A values to RE:
In 2001, the National Academy of Sciences Institute of Medicine (NAS IOM) determined that Vitamin A activity from carotenoids is only half of what was previously believed. To account for this difference, and to avoid confusion, the new unit Retinol Activity Equivalents (RAE) was defined. Retinol Equivalents (RE) are no longer used.
The following table summarizes the relationship between the different measures:
IU Details
At the time of this writing (2004), the RDI (Reference Daily Intake) of Vitamin A is 5000 IU. However, IU is an inaccurate measure of vitamin A activity because it overstates the contributions of the provitamin A carotenoids (by a factor of 6). The FDA (US Food and Drug Administration) is considering changing the RDI to express it in terms of RAE.
Because the conversion of IU to RAE is different for retinol and the carotenoids, you cannot convert IU to RAE (or RAE to IU) for Total Vitamin A unless you know the proportion of retinol to carotenoids in the sample.
For example, knowing that you have 40 IU of Total Vitamin A is not enough information to determine how much retinol and carotenoids you have. 40 IU of Total Vitamin A can come from 12 µg RAE of retinol, or from 2 µg RAE of carotenoids, or from 6 µg RAE retinol plus 1 µg RAE carotenoids, or from many other combinations of retinol and carotenoids. The following table summarizes:
nutraCoster Details
Entering Retinol or Carotenoids Values
When you enter RAE for retinol or any of the carotenoids, nutraCoster automatically calculates the IU and %RDI values for the nutrient.
Finally, nutraCoster willrecalculate the IU and %RDI values of Total Vitamin A based on the new values for retinol and carotenoids.
Example: Suppose you have 80 µg RAE Total Vitamin A, which is composed of 60 µg RAE retinol and 20 µg RAE total carotenoids. The following table lists the values for the example:
Now change the Total Vitamin A RAE to 120 µg RAE. nutraCoster performs the following steps:
Total Vitamin A RAE was the sum of the retinol and carotenoids values, so nutraCoster increases retinol and carotenoids proportionally to 90µg RAE and 30 µg RAE.
The new value of 90 µg RAE for retinol converts to 300 IU and 6 %RDI.
The new value of 30 µg RAE for carotenoids converts to 600 IU and 12 %RDI.
Using the new IU and %RDI values, Total Vitamin A is now 900 IU and 18 %RDI.
The following table shows the results after the change:
nutraCoster performs a similar series of steps when you enter IU or %RDI values for Total Vitamin A.
CarotenoidDetails
When you enter or change a value for Total Carotenoids, nutraCoster checks to see if the Total Carotenoids value was equal to the sum of the indivial Provitamin A Carotenoids before the change. If it was, nutraCoster recalculates the indivial carotenoid values so the sum of the values equals the new Total Carotenoids value, while keeping the proportions the same.
When you enter or change a value for any of the indivial carotenoids, nutraCoster checks to see if the Total Carotenoids value was equal to the sum of the indivial Provitamin A Carotenoids before the change. If so, nutraCoster adjusts the Total Carotenoids value to equal the sum of the indivial carotenoid values after the change.
为了统一计量膳食中的维生素A,而提出的一个概念。其含义是包括视黄醇和β-胡萝卜素在内的具有维生素A活性物质所相当的视黄醇量。
由于人体 维生素A 来源于动物性食物的维生素A和植物性食物中的 胡萝卜素 ( 维生素A原 ),而维生素A的常用计量单位为国际单位(IU),胡萝卜素的常用计量单位为μg(微克)或者mg(毫克),为了统一计量膳食中的维生素A, FAO /WHO(1967)提出了视黄醇当量(Retinol Equivalent, RE)概念。其含义是包括视黄醇和 β-胡萝卜素 在内的具有维生素A活性物质所相当的视黄醇量。
视黄醇当量、 维生素A 、 β-胡萝卜素 的换算关系如下:
1μg β-胡萝卜素=0.167μg视黄醇当量(理论上1分子β-胡萝卜素能形成2分子维生素A,但因为 胡萝卜素 的吸收率为1/3,而吸收后转化为维生素A的 转化率 又只有1/2,所以,1μg的胡萝卜素只能折算为0.556IU维生素A,即0.167μg视黄醇当量。1IU维生素A=0.3μg视黄醇当量)